Nut-lock.



L. A. GARGHEY. NUT LOOK.

APPLICATION FILED MAY 1, 1911. 1,036,825. v

.Witnesses.

Patented Aug. 27, 1912.

LOUIS ANTOINE GARCI-IEY, OF PARIS, FRANCE.

NUT-LOCK.

Specification of Letters Patent.

Application filed May 1, 1911.

Patented Aug. 27, 1912.

Serial No. 624,312.

['0 all whom it may concern:

Be it known that I, LoUIs ANTOINE GAR- CHEY, a citizen of the FrenchRepublic, residing at Paris, Republic of France, have invented certainnew and useful Improvements in Nut-Locks, of which the following is aspecification.

The problem to prevent the getting loose of nuts on bolts has not yetbeen solved in a satisfactory manner. The two principal reasons forwhich all solutions of the problem hitherto proposed have been rejectedare: (1) that the locking devices always necessitate the use of aseparate organ either in connection with the screw bolt or with the nutfor effectually locking the nut on the bolt, and (2) that there has tobe made a boring, a slot or the like either in the bolt or in the nutfor applying the locking device. The only really practical solution ofthe problem is to secure the nut on the bolt by means of a pin of softmalleable metal inserted in borings or grooves which have been arrangedin the bolt and in the nut. Such a locking device is simple tomanufacture and simple in application and it does not cost much. Up tothe present it has however been impossible to secure this pin in itsposition so that after a certain time it gets loose owing to thecontinuous vibrations and drops out of the nut even if it is wedgeshaped.

It has been proposed to substitute for the pin of soft metal, a smallpiece of easily fusible solder located in a recess of the nut and to bemelted after the nut has been screwed on so that the molten metal fillson the one hand the groove of the nut and on the other hand the spacesbetween the threads of the bolt. Although this locking device is veryeffective it is seldom used owing to the difiiculties of application. Ittakes much time to melt the metal and if the nuts are screwed on thebolt from below,

it often happens that the molten metal drops out of the nut.

The present invention relates to a looking device for screw nuts of thattype in which a locking pin is used for keying the nut on the bolt,means being provided for securing this pin in the locking position.

In the accompanying drawings one form of execution of the nut lock isshown by way of example Figure 1 shows in elevation partly in section aform of construction of the locking device with the auxiliary means forfacilitating the driving in of the locking pins. Fig. 2 is a viewsimilar to Fig. 1 showing the locking pins in looking position. Fig. 3is a plan view and Fig. 4 is a plan view, the guide cylinder for thelocking pins being removed.

. The improved nut lock consists of a looking pin of very malleablemetal, the length of which is preferably equal to about 1%; the heightof the nut so that, after the pin has been inserted and compressed, itsmetal can fill a recess provided between the nut and the bolt. Thelength of the pin in looking position is preferably equal to the heightof the nut. For compressing the metal of the locking pin a punch isused. The pin presents in its locking position a laterally curved part awhich penetrates into the said recess of the nut or of the screw bolt,so that the nut is locked on the bolt a ainst unscrewing from jolting orjarring, eing free however for removal with a wrench by the applicationof a little more force to start it than is ordinarily required. Thelocking pin itself is securely fastened in its locking position.

Spiralgrooves g, 9 g are provided in the bolt. This arrangement offersthe advantage over grooves parallel with the axis that the groove of thenut must always be opposite one of the grooves of the bolt provided thepitch of the spiral grooves of the bolt has been properly calculated. Atthe point of intersection of the two grooves there will always be formeda recess h to be filled out by the metal of the locking pin when thesame is compressed. The locking pin of soft malleable metal will bend atthe point of intersection of the two grooves and fill the recess h.

In order to prevent the weakening of the threads of the bolt 0 by thespiral grooves g the pitch of said spirals must be as near the verticalas possible. The three grooves g, 9 g are preferably arranged at uniformdistances apart from each other, the pitch of the spiral being equal tothree times the height of the nut (Z. A vertical groove 2' of the nuttherefore must always intersect with at least one of the three groovesof the bolt. If there are arranged two grooves 21-70 in the nut the oneopposite the other, the groove is of the nut will intersect the groovethe nut for about of their length, it is preferable to use auxiliarymeans designed to prevent the damaging of the threads of the bolt. Suchan auxiliary device consists of a short cylinder 0 the inner boring ofwhich is equal to the circumference of the screw bolt 0. This cylinder 0has two vertical borings pq which correspond to the grooves 6-70 of thenut cl. Said vertical borings are separated from the inner boring of thecylinder by a thin portion 0 of metal which forms a protecting sleevefor the upper end of the screw bolt, so that the threads of the boltcannot be damaged by the punch 8 used for forcing in the locking pinsm-t. In the lower end of the cylinder 0 a casing is providedwhichcorresponds to the shape of the nut. For looking a nut on the boltaccording to this invention the short cylinder 0 is placed upon the nutafter the same has been screwed on. The vertical borings pg of thecylinder 0 must register with the grooves 2'7c of the nut. The lockingpins mt of soft very malleable metal are inserted in the borings p g ofthe cylinder andin the grooves i7c of the nut respectively and forced inby means of a punch 8 until their upper ends are flush with the uppersurface of the nut. Fig. 1 shows the different parts in the positionsbefore the forcing in of the locking pins, Fig. 2 showingthe same in thepositions after said pins have been forced in. As can be seen-from Fig.2, only one of the locking pins, in the Copies of this patent may beobtained for five cents eachyby addressing the Commissioner of Patents,

present case the'pin m has bent so as to form the lateral projection afilling the recess h of the bolt. This'locking pin has adopted the shapem, the other locking pin having adopted the shape If. Only one of thepins, m, in the present case, acts as a key for the nut and is securelyfixed in its position the other pin t, having been merely compressed toa wedge shape, engaged only with the threads of the bolt. One of the twopins will always serve as a key but as one never can be sure whetherboth or only one of the pins will bend it is indispensable that bothpins be driven in.

It is obvious that, instead of the cylinder 0,any other equivalentauxiliary means can be used for facilitating the forcing in of thelocking pins.

I claim A nut-lock comprisinga nut having diametrically opposite groovesparallel with the axis, a bolt having three equally distributed helicalgrooves with a pitch equal to three times the height of the nut andlocking pins of soft malleable material driven into the groovesof thenut and adapted to be forced into the recessesformed at the points of intersection of the grooves of the nut and the bolt, and a cap to fit overthe nut and both having apertures adapted to register with the groovesof the nut to facilitate the foreing of the pins into therecesses.

, In witness whereof I. have hereunto set my handin the presence of twowitnesses.

LOUIS ANTOINE GAROHEY.

; Witnesses DEAN B. MASON, ALFRED Fnnv.

Washington, D. 0..

